2
* sd.c Copyright (C) 1992 Drew Eckhardt
3
* Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
5
* Linux scsi disk driver
6
* Initial versions: Drew Eckhardt
7
* Subsequent revisions: Eric Youngdale
8
* Modification history:
9
* - Drew Eckhardt <drew@colorado.edu> original
10
* - Eric Youngdale <eric@andante.org> add scatter-gather, multiple
11
* outstanding request, and other enhancements.
12
* Support loadable low-level scsi drivers.
13
* - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using
14
* eight major numbers.
15
* - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
16
* - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in
17
* sd_init and cleanups.
18
* - Alex Davis <letmein@erols.com> Fix problem where partition info
19
* not being read in sd_open. Fix problem where removable media
20
* could be ejected after sd_open.
21
* - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
22
* - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox
23
* <willy@debian.org>, Kurt Garloff <garloff@suse.de>:
24
* Support 32k/1M disks.
26
* Logging policy (needs CONFIG_SCSI_LOGGING defined):
27
* - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
28
* - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
29
* - entering sd_ioctl: SCSI_LOG_IOCTL level 1
30
* - entering other commands: SCSI_LOG_HLQUEUE level 3
31
* Note: when the logging level is set by the user, it must be greater
32
* than the level indicated above to trigger output.
35
#include <linux/module.h>
37
#include <linux/kernel.h>
39
#include <linux/bio.h>
40
#include <linux/genhd.h>
41
#include <linux/hdreg.h>
42
#include <linux/errno.h>
43
#include <linux/idr.h>
44
#include <linux/interrupt.h>
45
#include <linux/init.h>
46
#include <linux/blkdev.h>
47
#include <linux/blkpg.h>
48
#include <linux/delay.h>
49
#include <linux/mutex.h>
50
#include <linux/string_helpers.h>
51
#include <linux/async.h>
52
#include <linux/slab.h>
53
#include <asm/uaccess.h>
54
#include <asm/unaligned.h>
56
#include <scsi/scsi.h>
57
#include <scsi/scsi_cmnd.h>
58
#include <scsi/scsi_dbg.h>
59
#include <scsi/scsi_device.h>
60
#include <scsi/scsi_driver.h>
61
#include <scsi/scsi_eh.h>
62
#include <scsi/scsi_host.h>
63
#include <scsi/scsi_ioctl.h>
64
#include <scsi/scsicam.h>
67
#include "scsi_logging.h"
69
MODULE_AUTHOR("Eric Youngdale");
70
MODULE_DESCRIPTION("SCSI disk (sd) driver");
71
MODULE_LICENSE("GPL");
73
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
74
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
75
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
76
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
77
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
78
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
79
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
80
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
81
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
82
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
83
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
84
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
85
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
86
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
87
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
88
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
89
MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
90
MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
91
MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
93
#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
99
static void sd_config_discard(struct scsi_disk *, unsigned int);
100
static int sd_revalidate_disk(struct gendisk *);
101
static void sd_unlock_native_capacity(struct gendisk *disk);
102
static int sd_probe(struct device *);
103
static int sd_remove(struct device *);
104
static void sd_shutdown(struct device *);
105
static int sd_suspend(struct device *, pm_message_t state);
106
static int sd_resume(struct device *);
107
static void sd_rescan(struct device *);
108
static int sd_done(struct scsi_cmnd *);
109
static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
110
static void scsi_disk_release(struct device *cdev);
111
static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
112
static void sd_print_result(struct scsi_disk *, int);
114
static DEFINE_SPINLOCK(sd_index_lock);
115
static DEFINE_IDA(sd_index_ida);
117
/* This semaphore is used to mediate the 0->1 reference get in the
118
* face of object destruction (i.e. we can't allow a get on an
119
* object after last put) */
120
static DEFINE_MUTEX(sd_ref_mutex);
122
static struct kmem_cache *sd_cdb_cache;
123
static mempool_t *sd_cdb_pool;
125
static const char *sd_cache_types[] = {
126
"write through", "none", "write back",
127
"write back, no read (daft)"
131
sd_store_cache_type(struct device *dev, struct device_attribute *attr,
132
const char *buf, size_t count)
134
int i, ct = -1, rcd, wce, sp;
135
struct scsi_disk *sdkp = to_scsi_disk(dev);
136
struct scsi_device *sdp = sdkp->device;
139
struct scsi_mode_data data;
140
struct scsi_sense_hdr sshdr;
143
if (sdp->type != TYPE_DISK)
144
/* no cache control on RBC devices; theoretically they
145
* can do it, but there's probably so many exceptions
146
* it's not worth the risk */
149
for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
150
len = strlen(sd_cache_types[i]);
151
if (strncmp(sd_cache_types[i], buf, len) == 0 &&
159
rcd = ct & 0x01 ? 1 : 0;
160
wce = ct & 0x02 ? 1 : 0;
161
if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
162
SD_MAX_RETRIES, &data, NULL))
164
len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
165
data.block_descriptor_length);
166
buffer_data = buffer + data.header_length +
167
data.block_descriptor_length;
168
buffer_data[2] &= ~0x05;
169
buffer_data[2] |= wce << 2 | rcd;
170
sp = buffer_data[0] & 0x80 ? 1 : 0;
172
if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
173
SD_MAX_RETRIES, &data, &sshdr)) {
174
if (scsi_sense_valid(&sshdr))
175
sd_print_sense_hdr(sdkp, &sshdr);
178
revalidate_disk(sdkp->disk);
183
sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
184
const char *buf, size_t count)
186
struct scsi_disk *sdkp = to_scsi_disk(dev);
187
struct scsi_device *sdp = sdkp->device;
189
if (!capable(CAP_SYS_ADMIN))
192
sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
198
sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
199
const char *buf, size_t count)
201
struct scsi_disk *sdkp = to_scsi_disk(dev);
202
struct scsi_device *sdp = sdkp->device;
204
if (!capable(CAP_SYS_ADMIN))
207
if (sdp->type != TYPE_DISK)
210
sdp->allow_restart = simple_strtoul(buf, NULL, 10);
216
sd_show_cache_type(struct device *dev, struct device_attribute *attr,
219
struct scsi_disk *sdkp = to_scsi_disk(dev);
220
int ct = sdkp->RCD + 2*sdkp->WCE;
222
return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
226
sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
228
struct scsi_disk *sdkp = to_scsi_disk(dev);
230
return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
234
sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
237
struct scsi_disk *sdkp = to_scsi_disk(dev);
238
struct scsi_device *sdp = sdkp->device;
240
return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
244
sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
247
struct scsi_disk *sdkp = to_scsi_disk(dev);
249
return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
253
sd_show_protection_type(struct device *dev, struct device_attribute *attr,
256
struct scsi_disk *sdkp = to_scsi_disk(dev);
258
return snprintf(buf, 20, "%u\n", sdkp->protection_type);
262
sd_show_protection_mode(struct device *dev, struct device_attribute *attr,
265
struct scsi_disk *sdkp = to_scsi_disk(dev);
266
struct scsi_device *sdp = sdkp->device;
267
unsigned int dif, dix;
269
dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
270
dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
272
if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
278
return snprintf(buf, 20, "none\n");
280
return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
284
sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
287
struct scsi_disk *sdkp = to_scsi_disk(dev);
289
return snprintf(buf, 20, "%u\n", sdkp->ATO);
293
sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
296
struct scsi_disk *sdkp = to_scsi_disk(dev);
298
return snprintf(buf, 20, "%u\n", sdkp->lbpme);
301
static const char *lbp_mode[] = {
302
[SD_LBP_FULL] = "full",
303
[SD_LBP_UNMAP] = "unmap",
304
[SD_LBP_WS16] = "writesame_16",
305
[SD_LBP_WS10] = "writesame_10",
306
[SD_LBP_ZERO] = "writesame_zero",
307
[SD_LBP_DISABLE] = "disabled",
311
sd_show_provisioning_mode(struct device *dev, struct device_attribute *attr,
314
struct scsi_disk *sdkp = to_scsi_disk(dev);
316
return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
320
sd_store_provisioning_mode(struct device *dev, struct device_attribute *attr,
321
const char *buf, size_t count)
323
struct scsi_disk *sdkp = to_scsi_disk(dev);
324
struct scsi_device *sdp = sdkp->device;
326
if (!capable(CAP_SYS_ADMIN))
329
if (sdp->type != TYPE_DISK)
332
if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
333
sd_config_discard(sdkp, SD_LBP_UNMAP);
334
else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
335
sd_config_discard(sdkp, SD_LBP_WS16);
336
else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
337
sd_config_discard(sdkp, SD_LBP_WS10);
338
else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
339
sd_config_discard(sdkp, SD_LBP_ZERO);
340
else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
341
sd_config_discard(sdkp, SD_LBP_DISABLE);
348
static struct device_attribute sd_disk_attrs[] = {
349
__ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
350
sd_store_cache_type),
351
__ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
352
__ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
353
sd_store_allow_restart),
354
__ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
355
sd_store_manage_start_stop),
356
__ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
357
__ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL),
358
__ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
359
__ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
360
__ATTR(provisioning_mode, S_IRUGO|S_IWUSR, sd_show_provisioning_mode,
361
sd_store_provisioning_mode),
365
static struct class sd_disk_class = {
367
.owner = THIS_MODULE,
368
.dev_release = scsi_disk_release,
369
.dev_attrs = sd_disk_attrs,
372
static struct scsi_driver sd_template = {
373
.owner = THIS_MODULE,
378
.suspend = sd_suspend,
380
.shutdown = sd_shutdown,
387
* Device no to disk mapping:
389
* major disc2 disc p1
390
* |............|.............|....|....| <- dev_t
393
* Inside a major, we have 16k disks, however mapped non-
394
* contiguously. The first 16 disks are for major0, the next
395
* ones with major1, ... Disk 256 is for major0 again, disk 272
397
* As we stay compatible with our numbering scheme, we can reuse
398
* the well-know SCSI majors 8, 65--71, 136--143.
400
static int sd_major(int major_idx)
404
return SCSI_DISK0_MAJOR;
406
return SCSI_DISK1_MAJOR + major_idx - 1;
408
return SCSI_DISK8_MAJOR + major_idx - 8;
411
return 0; /* shut up gcc */
415
static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
417
struct scsi_disk *sdkp = NULL;
419
if (disk->private_data) {
420
sdkp = scsi_disk(disk);
421
if (scsi_device_get(sdkp->device) == 0)
422
get_device(&sdkp->dev);
429
static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
431
struct scsi_disk *sdkp;
433
mutex_lock(&sd_ref_mutex);
434
sdkp = __scsi_disk_get(disk);
435
mutex_unlock(&sd_ref_mutex);
439
static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
441
struct scsi_disk *sdkp;
443
mutex_lock(&sd_ref_mutex);
444
sdkp = dev_get_drvdata(dev);
446
sdkp = __scsi_disk_get(sdkp->disk);
447
mutex_unlock(&sd_ref_mutex);
451
static void scsi_disk_put(struct scsi_disk *sdkp)
453
struct scsi_device *sdev = sdkp->device;
455
mutex_lock(&sd_ref_mutex);
456
put_device(&sdkp->dev);
457
scsi_device_put(sdev);
458
mutex_unlock(&sd_ref_mutex);
461
static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
463
unsigned int prot_op = SCSI_PROT_NORMAL;
464
unsigned int dix = scsi_prot_sg_count(scmd);
466
if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
468
prot_op = SCSI_PROT_READ_PASS;
469
else if (dif && !dix)
470
prot_op = SCSI_PROT_READ_STRIP;
471
else if (!dif && dix)
472
prot_op = SCSI_PROT_READ_INSERT;
475
prot_op = SCSI_PROT_WRITE_PASS;
476
else if (dif && !dix)
477
prot_op = SCSI_PROT_WRITE_INSERT;
478
else if (!dif && dix)
479
prot_op = SCSI_PROT_WRITE_STRIP;
482
scsi_set_prot_op(scmd, prot_op);
483
scsi_set_prot_type(scmd, dif);
486
static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
488
struct request_queue *q = sdkp->disk->queue;
489
unsigned int logical_block_size = sdkp->device->sector_size;
490
unsigned int max_blocks = 0;
492
q->limits.discard_zeroes_data = sdkp->lbprz;
493
q->limits.discard_alignment = sdkp->unmap_alignment *
495
q->limits.discard_granularity =
496
max(sdkp->physical_block_size,
497
sdkp->unmap_granularity * logical_block_size);
502
q->limits.max_discard_sectors = 0;
503
queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
507
max_blocks = min_not_zero(sdkp->max_unmap_blocks, 0xffffffff);
511
max_blocks = min_not_zero(sdkp->max_ws_blocks, 0xffffffff);
515
max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
519
max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
520
q->limits.discard_zeroes_data = 1;
524
q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
525
queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
527
sdkp->provisioning_mode = mode;
531
* scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device
532
* @sdp: scsi device to operate one
533
* @rq: Request to prepare
535
* Will issue either UNMAP or WRITE SAME(16) depending on preference
536
* indicated by target device.
538
static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
540
struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
541
struct bio *bio = rq->bio;
542
sector_t sector = bio->bi_sector;
543
unsigned int nr_sectors = bio_sectors(bio);
549
if (sdkp->device->sector_size == 4096) {
554
rq->timeout = SD_TIMEOUT;
556
memset(rq->cmd, 0, rq->cmd_len);
558
page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
560
return BLKPREP_DEFER;
562
switch (sdkp->provisioning_mode) {
564
buf = page_address(page);
570
put_unaligned_be16(6 + 16, &buf[0]);
571
put_unaligned_be16(16, &buf[2]);
572
put_unaligned_be64(sector, &buf[8]);
573
put_unaligned_be32(nr_sectors, &buf[16]);
580
rq->cmd[0] = WRITE_SAME_16;
581
rq->cmd[1] = 0x8; /* UNMAP */
582
put_unaligned_be64(sector, &rq->cmd[2]);
583
put_unaligned_be32(nr_sectors, &rq->cmd[10]);
585
len = sdkp->device->sector_size;
591
rq->cmd[0] = WRITE_SAME;
592
if (sdkp->provisioning_mode == SD_LBP_WS10)
593
rq->cmd[1] = 0x8; /* UNMAP */
594
put_unaligned_be32(sector, &rq->cmd[2]);
595
put_unaligned_be16(nr_sectors, &rq->cmd[7]);
597
len = sdkp->device->sector_size;
605
blk_add_request_payload(rq, page, len);
606
ret = scsi_setup_blk_pc_cmnd(sdp, rq);
607
rq->buffer = page_address(page);
610
if (ret != BLKPREP_OK) {
617
static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
619
rq->timeout = SD_FLUSH_TIMEOUT;
620
rq->retries = SD_MAX_RETRIES;
621
rq->cmd[0] = SYNCHRONIZE_CACHE;
624
return scsi_setup_blk_pc_cmnd(sdp, rq);
627
static void sd_unprep_fn(struct request_queue *q, struct request *rq)
629
if (rq->cmd_flags & REQ_DISCARD) {
630
free_page((unsigned long)rq->buffer);
636
* sd_init_command - build a scsi (read or write) command from
637
* information in the request structure.
638
* @SCpnt: pointer to mid-level's per scsi command structure that
639
* contains request and into which the scsi command is written
641
* Returns 1 if successful and 0 if error (or cannot be done now).
643
static int sd_prep_fn(struct request_queue *q, struct request *rq)
645
struct scsi_cmnd *SCpnt;
646
struct scsi_device *sdp = q->queuedata;
647
struct gendisk *disk = rq->rq_disk;
648
struct scsi_disk *sdkp;
649
sector_t block = blk_rq_pos(rq);
651
unsigned int this_count = blk_rq_sectors(rq);
653
unsigned char protect;
656
* Discard request come in as REQ_TYPE_FS but we turn them into
657
* block PC requests to make life easier.
659
if (rq->cmd_flags & REQ_DISCARD) {
660
ret = scsi_setup_discard_cmnd(sdp, rq);
662
} else if (rq->cmd_flags & REQ_FLUSH) {
663
ret = scsi_setup_flush_cmnd(sdp, rq);
665
} else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
666
ret = scsi_setup_blk_pc_cmnd(sdp, rq);
668
} else if (rq->cmd_type != REQ_TYPE_FS) {
672
ret = scsi_setup_fs_cmnd(sdp, rq);
673
if (ret != BLKPREP_OK)
676
sdkp = scsi_disk(disk);
678
/* from here on until we're complete, any goto out
679
* is used for a killable error condition */
682
SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
683
"sd_init_command: block=%llu, "
685
(unsigned long long)block,
688
if (!sdp || !scsi_device_online(sdp) ||
689
block + blk_rq_sectors(rq) > get_capacity(disk)) {
690
SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
691
"Finishing %u sectors\n",
692
blk_rq_sectors(rq)));
693
SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
694
"Retry with 0x%p\n", SCpnt));
700
* quietly refuse to do anything to a changed disc until
701
* the changed bit has been reset
703
/* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
708
* Some SD card readers can't handle multi-sector accesses which touch
709
* the last one or two hardware sectors. Split accesses as needed.
711
threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
712
(sdp->sector_size / 512);
714
if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
715
if (block < threshold) {
716
/* Access up to the threshold but not beyond */
717
this_count = threshold - block;
719
/* Access only a single hardware sector */
720
this_count = sdp->sector_size / 512;
724
SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
725
(unsigned long long)block));
728
* If we have a 1K hardware sectorsize, prevent access to single
729
* 512 byte sectors. In theory we could handle this - in fact
730
* the scsi cdrom driver must be able to handle this because
731
* we typically use 1K blocksizes, and cdroms typically have
732
* 2K hardware sectorsizes. Of course, things are simpler
733
* with the cdrom, since it is read-only. For performance
734
* reasons, the filesystems should be able to handle this
735
* and not force the scsi disk driver to use bounce buffers
738
if (sdp->sector_size == 1024) {
739
if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
740
scmd_printk(KERN_ERR, SCpnt,
741
"Bad block number requested\n");
745
this_count = this_count >> 1;
748
if (sdp->sector_size == 2048) {
749
if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
750
scmd_printk(KERN_ERR, SCpnt,
751
"Bad block number requested\n");
755
this_count = this_count >> 2;
758
if (sdp->sector_size == 4096) {
759
if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
760
scmd_printk(KERN_ERR, SCpnt,
761
"Bad block number requested\n");
765
this_count = this_count >> 3;
768
if (rq_data_dir(rq) == WRITE) {
769
if (!sdp->writeable) {
772
SCpnt->cmnd[0] = WRITE_6;
773
SCpnt->sc_data_direction = DMA_TO_DEVICE;
775
if (blk_integrity_rq(rq) &&
776
sd_dif_prepare(rq, block, sdp->sector_size) == -EIO)
779
} else if (rq_data_dir(rq) == READ) {
780
SCpnt->cmnd[0] = READ_6;
781
SCpnt->sc_data_direction = DMA_FROM_DEVICE;
783
scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
787
SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
788
"%s %d/%u 512 byte blocks.\n",
789
(rq_data_dir(rq) == WRITE) ?
790
"writing" : "reading", this_count,
791
blk_rq_sectors(rq)));
793
/* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
794
host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
800
if (host_dif == SD_DIF_TYPE2_PROTECTION) {
801
SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
803
if (unlikely(SCpnt->cmnd == NULL)) {
808
SCpnt->cmd_len = SD_EXT_CDB_SIZE;
809
memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
810
SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
811
SCpnt->cmnd[7] = 0x18;
812
SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
813
SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
816
SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
817
SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
818
SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
819
SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
820
SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
821
SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
822
SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
823
SCpnt->cmnd[19] = (unsigned char) block & 0xff;
825
/* Expected Indirect LBA */
826
SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
827
SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
828
SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
829
SCpnt->cmnd[23] = (unsigned char) block & 0xff;
831
/* Transfer length */
832
SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
833
SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
834
SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
835
SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
836
} else if (block > 0xffffffff) {
837
SCpnt->cmnd[0] += READ_16 - READ_6;
838
SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
839
SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
840
SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
841
SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
842
SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
843
SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
844
SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
845
SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
846
SCpnt->cmnd[9] = (unsigned char) block & 0xff;
847
SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
848
SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
849
SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
850
SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
851
SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
852
} else if ((this_count > 0xff) || (block > 0x1fffff) ||
853
scsi_device_protection(SCpnt->device) ||
854
SCpnt->device->use_10_for_rw) {
855
if (this_count > 0xffff)
858
SCpnt->cmnd[0] += READ_10 - READ_6;
859
SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
860
SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
861
SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
862
SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
863
SCpnt->cmnd[5] = (unsigned char) block & 0xff;
864
SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
865
SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
866
SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
868
if (unlikely(rq->cmd_flags & REQ_FUA)) {
870
* This happens only if this drive failed
871
* 10byte rw command with ILLEGAL_REQUEST
872
* during operation and thus turned off
875
scmd_printk(KERN_ERR, SCpnt,
876
"FUA write on READ/WRITE(6) drive\n");
880
SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
881
SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
882
SCpnt->cmnd[3] = (unsigned char) block & 0xff;
883
SCpnt->cmnd[4] = (unsigned char) this_count;
886
SCpnt->sdb.length = this_count * sdp->sector_size;
888
/* If DIF or DIX is enabled, tell HBA how to handle request */
889
if (host_dif || scsi_prot_sg_count(SCpnt))
890
sd_prot_op(SCpnt, host_dif);
893
* We shouldn't disconnect in the middle of a sector, so with a dumb
894
* host adapter, it's safe to assume that we can at least transfer
895
* this many bytes between each connect / disconnect.
897
SCpnt->transfersize = sdp->sector_size;
898
SCpnt->underflow = this_count << 9;
899
SCpnt->allowed = SD_MAX_RETRIES;
902
* This indicates that the command is ready from our end to be
907
return scsi_prep_return(q, rq, ret);
911
* sd_open - open a scsi disk device
912
* @inode: only i_rdev member may be used
913
* @filp: only f_mode and f_flags may be used
915
* Returns 0 if successful. Returns a negated errno value in case
918
* Note: This can be called from a user context (e.g. fsck(1) )
919
* or from within the kernel (e.g. as a result of a mount(1) ).
920
* In the latter case @inode and @filp carry an abridged amount
921
* of information as noted above.
923
* Locking: called with bdev->bd_mutex held.
925
static int sd_open(struct block_device *bdev, fmode_t mode)
927
struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
928
struct scsi_device *sdev;
934
SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
938
retval = scsi_autopm_get_device(sdev);
943
* If the device is in error recovery, wait until it is done.
944
* If the device is offline, then disallow any access to it.
947
if (!scsi_block_when_processing_errors(sdev))
950
if (sdev->removable || sdkp->write_prot)
951
check_disk_change(bdev);
954
* If the drive is empty, just let the open fail.
957
if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
961
* If the device has the write protect tab set, have the open fail
962
* if the user expects to be able to write to the thing.
965
if (sdkp->write_prot && (mode & FMODE_WRITE))
969
* It is possible that the disk changing stuff resulted in
970
* the device being taken offline. If this is the case,
971
* report this to the user, and don't pretend that the
972
* open actually succeeded.
975
if (!scsi_device_online(sdev))
978
if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
979
if (scsi_block_when_processing_errors(sdev))
980
scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
986
scsi_autopm_put_device(sdev);
993
* sd_release - invoked when the (last) close(2) is called on this
995
* @inode: only i_rdev member may be used
996
* @filp: only f_mode and f_flags may be used
1000
* Note: may block (uninterruptible) if error recovery is underway
1003
* Locking: called with bdev->bd_mutex held.
1005
static int sd_release(struct gendisk *disk, fmode_t mode)
1007
struct scsi_disk *sdkp = scsi_disk(disk);
1008
struct scsi_device *sdev = sdkp->device;
1010
SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1012
if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1013
if (scsi_block_when_processing_errors(sdev))
1014
scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1018
* XXX and what if there are packets in flight and this close()
1019
* XXX is followed by a "rmmod sd_mod"?
1022
scsi_autopm_put_device(sdev);
1023
scsi_disk_put(sdkp);
1027
static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1029
struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1030
struct scsi_device *sdp = sdkp->device;
1031
struct Scsi_Host *host = sdp->host;
1034
/* default to most commonly used values */
1035
diskinfo[0] = 0x40; /* 1 << 6 */
1036
diskinfo[1] = 0x20; /* 1 << 5 */
1037
diskinfo[2] = sdkp->capacity >> 11;
1039
/* override with calculated, extended default, or driver values */
1040
if (host->hostt->bios_param)
1041
host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1043
scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1045
geo->heads = diskinfo[0];
1046
geo->sectors = diskinfo[1];
1047
geo->cylinders = diskinfo[2];
1052
* sd_ioctl - process an ioctl
1053
* @inode: only i_rdev/i_bdev members may be used
1054
* @filp: only f_mode and f_flags may be used
1055
* @cmd: ioctl command number
1056
* @arg: this is third argument given to ioctl(2) system call.
1057
* Often contains a pointer.
1059
* Returns 0 if successful (some ioctls return positive numbers on
1060
* success as well). Returns a negated errno value in case of error.
1062
* Note: most ioctls are forward onto the block subsystem or further
1063
* down in the scsi subsystem.
1065
static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1066
unsigned int cmd, unsigned long arg)
1068
struct gendisk *disk = bdev->bd_disk;
1069
struct scsi_disk *sdkp = scsi_disk(disk);
1070
struct scsi_device *sdp = sdkp->device;
1071
void __user *p = (void __user *)arg;
1074
SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1075
"cmd=0x%x\n", disk->disk_name, cmd));
1078
* If we are in the middle of error recovery, don't let anyone
1079
* else try and use this device. Also, if error recovery fails, it
1080
* may try and take the device offline, in which case all further
1081
* access to the device is prohibited.
1083
error = scsi_nonblockable_ioctl(sdp, cmd, p,
1084
(mode & FMODE_NDELAY) != 0);
1085
if (!scsi_block_when_processing_errors(sdp) || !error)
1089
* Send SCSI addressing ioctls directly to mid level, send other
1090
* ioctls to block level and then onto mid level if they can't be
1094
case SCSI_IOCTL_GET_IDLUN:
1095
case SCSI_IOCTL_GET_BUS_NUMBER:
1096
error = scsi_ioctl(sdp, cmd, p);
1099
error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p);
1100
if (error != -ENOTTY)
1102
error = scsi_ioctl(sdp, cmd, p);
1109
static void set_media_not_present(struct scsi_disk *sdkp)
1111
if (sdkp->media_present)
1112
sdkp->device->changed = 1;
1114
if (sdkp->device->removable) {
1115
sdkp->media_present = 0;
1120
static int media_not_present(struct scsi_disk *sdkp,
1121
struct scsi_sense_hdr *sshdr)
1123
if (!scsi_sense_valid(sshdr))
1126
/* not invoked for commands that could return deferred errors */
1127
switch (sshdr->sense_key) {
1128
case UNIT_ATTENTION:
1130
/* medium not present */
1131
if (sshdr->asc == 0x3A) {
1132
set_media_not_present(sdkp);
1140
* sd_check_events - check media events
1141
* @disk: kernel device descriptor
1142
* @clearing: disk events currently being cleared
1144
* Returns mask of DISK_EVENT_*.
1146
* Note: this function is invoked from the block subsystem.
1148
static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1150
struct scsi_disk *sdkp = scsi_disk(disk);
1151
struct scsi_device *sdp = sdkp->device;
1152
struct scsi_sense_hdr *sshdr = NULL;
1155
SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1158
* If the device is offline, don't send any commands - just pretend as
1159
* if the command failed. If the device ever comes back online, we
1160
* can deal with it then. It is only because of unrecoverable errors
1161
* that we would ever take a device offline in the first place.
1163
if (!scsi_device_online(sdp)) {
1164
set_media_not_present(sdkp);
1169
* Using TEST_UNIT_READY enables differentiation between drive with
1170
* no cartridge loaded - NOT READY, drive with changed cartridge -
1171
* UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1173
* Drives that auto spin down. eg iomega jaz 1G, will be started
1174
* by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1175
* sd_revalidate() is called.
1179
if (scsi_block_when_processing_errors(sdp)) {
1180
sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1181
retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1185
/* failed to execute TUR, assume media not present */
1186
if (host_byte(retval)) {
1187
set_media_not_present(sdkp);
1191
if (media_not_present(sdkp, sshdr))
1195
* For removable scsi disk we have to recognise the presence
1196
* of a disk in the drive.
1198
if (!sdkp->media_present)
1200
sdkp->media_present = 1;
1203
* sdp->changed is set under the following conditions:
1205
* Medium present state has changed in either direction.
1206
* Device has indicated UNIT_ATTENTION.
1209
retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1214
static int sd_sync_cache(struct scsi_disk *sdkp)
1217
struct scsi_device *sdp = sdkp->device;
1218
struct scsi_sense_hdr sshdr;
1220
if (!scsi_device_online(sdp))
1224
for (retries = 3; retries > 0; --retries) {
1225
unsigned char cmd[10] = { 0 };
1227
cmd[0] = SYNCHRONIZE_CACHE;
1229
* Leave the rest of the command zero to indicate
1232
res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
1233
SD_FLUSH_TIMEOUT, SD_MAX_RETRIES, NULL);
1239
sd_print_result(sdkp, res);
1240
if (driver_byte(res) & DRIVER_SENSE)
1241
sd_print_sense_hdr(sdkp, &sshdr);
1249
static void sd_rescan(struct device *dev)
1251
struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1254
revalidate_disk(sdkp->disk);
1255
scsi_disk_put(sdkp);
1260
#ifdef CONFIG_COMPAT
1262
* This gets directly called from VFS. When the ioctl
1263
* is not recognized we go back to the other translation paths.
1265
static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1266
unsigned int cmd, unsigned long arg)
1268
struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1271
* If we are in the middle of error recovery, don't let anyone
1272
* else try and use this device. Also, if error recovery fails, it
1273
* may try and take the device offline, in which case all further
1274
* access to the device is prohibited.
1276
if (!scsi_block_when_processing_errors(sdev))
1279
if (sdev->host->hostt->compat_ioctl) {
1282
ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1288
* Let the static ioctl translation table take care of it.
1290
return -ENOIOCTLCMD;
1294
static const struct block_device_operations sd_fops = {
1295
.owner = THIS_MODULE,
1297
.release = sd_release,
1299
.getgeo = sd_getgeo,
1300
#ifdef CONFIG_COMPAT
1301
.compat_ioctl = sd_compat_ioctl,
1303
.check_events = sd_check_events,
1304
.revalidate_disk = sd_revalidate_disk,
1305
.unlock_native_capacity = sd_unlock_native_capacity,
1308
static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1310
u64 start_lba = blk_rq_pos(scmd->request);
1311
u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1315
* resid is optional but mostly filled in. When it's unused,
1316
* its value is zero, so we assume the whole buffer transferred
1318
unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1319
unsigned int good_bytes;
1321
if (scmd->request->cmd_type != REQ_TYPE_FS)
1324
info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1325
SCSI_SENSE_BUFFERSIZE,
1330
if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1333
if (scmd->device->sector_size < 512) {
1334
/* only legitimate sector_size here is 256 */
1338
/* be careful ... don't want any overflows */
1339
u64 factor = scmd->device->sector_size / 512;
1340
do_div(start_lba, factor);
1341
do_div(end_lba, factor);
1344
/* The bad lba was reported incorrectly, we have no idea where
1347
if (bad_lba < start_lba || bad_lba >= end_lba)
1350
/* This computation should always be done in terms of
1351
* the resolution of the device's medium.
1353
good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1354
return min(good_bytes, transferred);
1358
* sd_done - bottom half handler: called when the lower level
1359
* driver has completed (successfully or otherwise) a scsi command.
1360
* @SCpnt: mid-level's per command structure.
1362
* Note: potentially run from within an ISR. Must not block.
1364
static int sd_done(struct scsi_cmnd *SCpnt)
1366
int result = SCpnt->result;
1367
unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1368
struct scsi_sense_hdr sshdr;
1369
struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1370
int sense_valid = 0;
1371
int sense_deferred = 0;
1372
unsigned char op = SCpnt->cmnd[0];
1374
if ((SCpnt->request->cmd_flags & REQ_DISCARD) && !result)
1375
scsi_set_resid(SCpnt, 0);
1378
sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1380
sense_deferred = scsi_sense_is_deferred(&sshdr);
1382
#ifdef CONFIG_SCSI_LOGGING
1383
SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1385
SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1386
"sd_done: sb[respc,sk,asc,"
1387
"ascq]=%x,%x,%x,%x\n",
1388
sshdr.response_code,
1389
sshdr.sense_key, sshdr.asc,
1393
if (driver_byte(result) != DRIVER_SENSE &&
1394
(!sense_valid || sense_deferred))
1397
switch (sshdr.sense_key) {
1398
case HARDWARE_ERROR:
1400
good_bytes = sd_completed_bytes(SCpnt);
1402
case RECOVERED_ERROR:
1403
good_bytes = scsi_bufflen(SCpnt);
1406
/* This indicates a false check condition, so ignore it. An
1407
* unknown amount of data was transferred so treat it as an
1410
scsi_print_sense("sd", SCpnt);
1412
memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1414
case ABORTED_COMMAND:
1415
if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1416
good_bytes = sd_completed_bytes(SCpnt);
1418
case ILLEGAL_REQUEST:
1419
if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
1420
good_bytes = sd_completed_bytes(SCpnt);
1421
/* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1422
if ((sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1423
(op == UNMAP || op == WRITE_SAME_16 || op == WRITE_SAME))
1424
sd_config_discard(sdkp, SD_LBP_DISABLE);
1430
if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1431
sd_dif_complete(SCpnt, good_bytes);
1433
if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
1434
== SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1436
/* We have to print a failed command here as the
1437
* extended CDB gets freed before scsi_io_completion()
1441
scsi_print_command(SCpnt);
1443
mempool_free(SCpnt->cmnd, sd_cdb_pool);
1452
* spinup disk - called only in sd_revalidate_disk()
1455
sd_spinup_disk(struct scsi_disk *sdkp)
1457
unsigned char cmd[10];
1458
unsigned long spintime_expire = 0;
1459
int retries, spintime;
1460
unsigned int the_result;
1461
struct scsi_sense_hdr sshdr;
1462
int sense_valid = 0;
1466
/* Spin up drives, as required. Only do this at boot time */
1467
/* Spinup needs to be done for module loads too. */
1472
cmd[0] = TEST_UNIT_READY;
1473
memset((void *) &cmd[1], 0, 9);
1475
the_result = scsi_execute_req(sdkp->device, cmd,
1478
SD_MAX_RETRIES, NULL);
1481
* If the drive has indicated to us that it
1482
* doesn't have any media in it, don't bother
1483
* with any more polling.
1485
if (media_not_present(sdkp, &sshdr))
1489
sense_valid = scsi_sense_valid(&sshdr);
1491
} while (retries < 3 &&
1492
(!scsi_status_is_good(the_result) ||
1493
((driver_byte(the_result) & DRIVER_SENSE) &&
1494
sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1496
if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1497
/* no sense, TUR either succeeded or failed
1498
* with a status error */
1499
if(!spintime && !scsi_status_is_good(the_result)) {
1500
sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1501
sd_print_result(sdkp, the_result);
1507
* The device does not want the automatic start to be issued.
1509
if (sdkp->device->no_start_on_add)
1512
if (sense_valid && sshdr.sense_key == NOT_READY) {
1513
if (sshdr.asc == 4 && sshdr.ascq == 3)
1514
break; /* manual intervention required */
1515
if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1516
break; /* standby */
1517
if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1518
break; /* unavailable */
1520
* Issue command to spin up drive when not ready
1523
sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1524
cmd[0] = START_STOP;
1525
cmd[1] = 1; /* Return immediately */
1526
memset((void *) &cmd[2], 0, 8);
1527
cmd[4] = 1; /* Start spin cycle */
1528
if (sdkp->device->start_stop_pwr_cond)
1530
scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1532
SD_TIMEOUT, SD_MAX_RETRIES,
1534
spintime_expire = jiffies + 100 * HZ;
1537
/* Wait 1 second for next try */
1542
* Wait for USB flash devices with slow firmware.
1543
* Yes, this sense key/ASC combination shouldn't
1544
* occur here. It's characteristic of these devices.
1546
} else if (sense_valid &&
1547
sshdr.sense_key == UNIT_ATTENTION &&
1548
sshdr.asc == 0x28) {
1550
spintime_expire = jiffies + 5 * HZ;
1553
/* Wait 1 second for next try */
1556
/* we don't understand the sense code, so it's
1557
* probably pointless to loop */
1559
sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1560
sd_print_sense_hdr(sdkp, &sshdr);
1565
} while (spintime && time_before_eq(jiffies, spintime_expire));
1568
if (scsi_status_is_good(the_result))
1571
printk("not responding...\n");
1577
* Determine whether disk supports Data Integrity Field.
1579
static void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1581
struct scsi_device *sdp = sdkp->device;
1584
if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1587
type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1589
if (type == sdkp->protection_type || !sdkp->first_scan)
1592
sdkp->protection_type = type;
1594
if (type > SD_DIF_TYPE3_PROTECTION) {
1595
sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \
1596
"protection type %u. Disabling disk!\n", type);
1601
if (scsi_host_dif_capable(sdp->host, type))
1602
sd_printk(KERN_NOTICE, sdkp,
1603
"Enabling DIF Type %u protection\n", type);
1605
sd_printk(KERN_NOTICE, sdkp,
1606
"Disabling DIF Type %u protection\n", type);
1609
static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1610
struct scsi_sense_hdr *sshdr, int sense_valid,
1613
sd_print_result(sdkp, the_result);
1614
if (driver_byte(the_result) & DRIVER_SENSE)
1615
sd_print_sense_hdr(sdkp, sshdr);
1617
sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1620
* Set dirty bit for removable devices if not ready -
1621
* sometimes drives will not report this properly.
1623
if (sdp->removable &&
1624
sense_valid && sshdr->sense_key == NOT_READY)
1625
set_media_not_present(sdkp);
1628
* We used to set media_present to 0 here to indicate no media
1629
* in the drive, but some drives fail read capacity even with
1630
* media present, so we can't do that.
1632
sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1636
#if RC16_LEN > SD_BUF_SIZE
1637
#error RC16_LEN must not be more than SD_BUF_SIZE
1640
#define READ_CAPACITY_RETRIES_ON_RESET 10
1642
static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1643
unsigned char *buffer)
1645
unsigned char cmd[16];
1646
struct scsi_sense_hdr sshdr;
1647
int sense_valid = 0;
1649
int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1650
unsigned int alignment;
1651
unsigned long long lba;
1652
unsigned sector_size;
1654
if (sdp->no_read_capacity_16)
1659
cmd[0] = SERVICE_ACTION_IN;
1660
cmd[1] = SAI_READ_CAPACITY_16;
1662
memset(buffer, 0, RC16_LEN);
1664
the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1665
buffer, RC16_LEN, &sshdr,
1666
SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1668
if (media_not_present(sdkp, &sshdr))
1672
sense_valid = scsi_sense_valid(&sshdr);
1674
sshdr.sense_key == ILLEGAL_REQUEST &&
1675
(sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1677
/* Invalid Command Operation Code or
1678
* Invalid Field in CDB, just retry
1679
* silently with RC10 */
1682
sshdr.sense_key == UNIT_ATTENTION &&
1683
sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1684
/* Device reset might occur several times,
1685
* give it one more chance */
1686
if (--reset_retries > 0)
1691
} while (the_result && retries);
1694
sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1695
read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1699
sector_size = get_unaligned_be32(&buffer[8]);
1700
lba = get_unaligned_be64(&buffer[0]);
1702
sd_read_protection_type(sdkp, buffer);
1704
if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1705
sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1706
"kernel compiled with support for large block "
1712
/* Logical blocks per physical block exponent */
1713
sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
1715
/* Lowest aligned logical block */
1716
alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1717
blk_queue_alignment_offset(sdp->request_queue, alignment);
1718
if (alignment && sdkp->first_scan)
1719
sd_printk(KERN_NOTICE, sdkp,
1720
"physical block alignment offset: %u\n", alignment);
1722
if (buffer[14] & 0x80) { /* LBPME */
1725
if (buffer[14] & 0x40) /* LBPRZ */
1728
sd_config_discard(sdkp, SD_LBP_WS16);
1731
sdkp->capacity = lba + 1;
1735
static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
1736
unsigned char *buffer)
1738
unsigned char cmd[16];
1739
struct scsi_sense_hdr sshdr;
1740
int sense_valid = 0;
1742
int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1744
unsigned sector_size;
1747
cmd[0] = READ_CAPACITY;
1748
memset(&cmd[1], 0, 9);
1749
memset(buffer, 0, 8);
1751
the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1753
SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1755
if (media_not_present(sdkp, &sshdr))
1759
sense_valid = scsi_sense_valid(&sshdr);
1761
sshdr.sense_key == UNIT_ATTENTION &&
1762
sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1763
/* Device reset might occur several times,
1764
* give it one more chance */
1765
if (--reset_retries > 0)
1770
} while (the_result && retries);
1773
sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1774
read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1778
sector_size = get_unaligned_be32(&buffer[4]);
1779
lba = get_unaligned_be32(&buffer[0]);
1781
if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
1782
/* Some buggy (usb cardreader) devices return an lba of
1783
0xffffffff when the want to report a size of 0 (with
1784
which they really mean no media is present) */
1786
sdkp->physical_block_size = sector_size;
1790
if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
1791
sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1792
"kernel compiled with support for large block "
1798
sdkp->capacity = lba + 1;
1799
sdkp->physical_block_size = sector_size;
1803
static int sd_try_rc16_first(struct scsi_device *sdp)
1805
if (sdp->host->max_cmd_len < 16)
1807
if (sdp->scsi_level > SCSI_SPC_2)
1809
if (scsi_device_protection(sdp))
1815
* read disk capacity
1818
sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1821
struct scsi_device *sdp = sdkp->device;
1822
sector_t old_capacity = sdkp->capacity;
1824
if (sd_try_rc16_first(sdp)) {
1825
sector_size = read_capacity_16(sdkp, sdp, buffer);
1826
if (sector_size == -EOVERFLOW)
1828
if (sector_size == -ENODEV)
1830
if (sector_size < 0)
1831
sector_size = read_capacity_10(sdkp, sdp, buffer);
1832
if (sector_size < 0)
1835
sector_size = read_capacity_10(sdkp, sdp, buffer);
1836
if (sector_size == -EOVERFLOW)
1838
if (sector_size < 0)
1840
if ((sizeof(sdkp->capacity) > 4) &&
1841
(sdkp->capacity > 0xffffffffULL)) {
1842
int old_sector_size = sector_size;
1843
sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1844
"Trying to use READ CAPACITY(16).\n");
1845
sector_size = read_capacity_16(sdkp, sdp, buffer);
1846
if (sector_size < 0) {
1847
sd_printk(KERN_NOTICE, sdkp,
1848
"Using 0xffffffff as device size\n");
1849
sdkp->capacity = 1 + (sector_t) 0xffffffff;
1850
sector_size = old_sector_size;
1856
/* Some devices are known to return the total number of blocks,
1857
* not the highest block number. Some devices have versions
1858
* which do this and others which do not. Some devices we might
1859
* suspect of doing this but we don't know for certain.
1861
* If we know the reported capacity is wrong, decrement it. If
1862
* we can only guess, then assume the number of blocks is even
1863
* (usually true but not always) and err on the side of lowering
1866
if (sdp->fix_capacity ||
1867
(sdp->guess_capacity && (sdkp->capacity & 0x01))) {
1868
sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
1869
"from its reported value: %llu\n",
1870
(unsigned long long) sdkp->capacity);
1875
if (sector_size == 0) {
1877
sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1881
if (sector_size != 512 &&
1882
sector_size != 1024 &&
1883
sector_size != 2048 &&
1884
sector_size != 4096 &&
1885
sector_size != 256) {
1886
sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1889
* The user might want to re-format the drive with
1890
* a supported sectorsize. Once this happens, it
1891
* would be relatively trivial to set the thing up.
1892
* For this reason, we leave the thing in the table.
1896
* set a bogus sector size so the normal read/write
1897
* logic in the block layer will eventually refuse any
1898
* request on this device without tripping over power
1899
* of two sector size assumptions
1903
blk_queue_logical_block_size(sdp->request_queue, sector_size);
1906
char cap_str_2[10], cap_str_10[10];
1907
u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
1909
string_get_size(sz, STRING_UNITS_2, cap_str_2,
1911
string_get_size(sz, STRING_UNITS_10, cap_str_10,
1912
sizeof(cap_str_10));
1914
if (sdkp->first_scan || old_capacity != sdkp->capacity) {
1915
sd_printk(KERN_NOTICE, sdkp,
1916
"%llu %d-byte logical blocks: (%s/%s)\n",
1917
(unsigned long long)sdkp->capacity,
1918
sector_size, cap_str_10, cap_str_2);
1920
if (sdkp->physical_block_size != sector_size)
1921
sd_printk(KERN_NOTICE, sdkp,
1922
"%u-byte physical blocks\n",
1923
sdkp->physical_block_size);
1927
/* Rescale capacity to 512-byte units */
1928
if (sector_size == 4096)
1929
sdkp->capacity <<= 3;
1930
else if (sector_size == 2048)
1931
sdkp->capacity <<= 2;
1932
else if (sector_size == 1024)
1933
sdkp->capacity <<= 1;
1934
else if (sector_size == 256)
1935
sdkp->capacity >>= 1;
1937
blk_queue_physical_block_size(sdp->request_queue,
1938
sdkp->physical_block_size);
1939
sdkp->device->sector_size = sector_size;
1942
/* called with buffer of length 512 */
1944
sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
1945
unsigned char *buffer, int len, struct scsi_mode_data *data,
1946
struct scsi_sense_hdr *sshdr)
1948
return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1949
SD_TIMEOUT, SD_MAX_RETRIES, data,
1954
* read write protect setting, if possible - called only in sd_revalidate_disk()
1955
* called with buffer of length SD_BUF_SIZE
1958
sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
1961
struct scsi_device *sdp = sdkp->device;
1962
struct scsi_mode_data data;
1963
int old_wp = sdkp->write_prot;
1965
set_disk_ro(sdkp->disk, 0);
1966
if (sdp->skip_ms_page_3f) {
1967
sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1971
if (sdp->use_192_bytes_for_3f) {
1972
res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1975
* First attempt: ask for all pages (0x3F), but only 4 bytes.
1976
* We have to start carefully: some devices hang if we ask
1977
* for more than is available.
1979
res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1982
* Second attempt: ask for page 0 When only page 0 is
1983
* implemented, a request for page 3F may return Sense Key
1984
* 5: Illegal Request, Sense Code 24: Invalid field in
1987
if (!scsi_status_is_good(res))
1988
res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1991
* Third attempt: ask 255 bytes, as we did earlier.
1993
if (!scsi_status_is_good(res))
1994
res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
1998
if (!scsi_status_is_good(res)) {
1999
sd_printk(KERN_WARNING, sdkp,
2000
"Test WP failed, assume Write Enabled\n");
2002
sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2003
set_disk_ro(sdkp->disk, sdkp->write_prot);
2004
if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2005
sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2006
sdkp->write_prot ? "on" : "off");
2007
sd_printk(KERN_DEBUG, sdkp,
2008
"Mode Sense: %02x %02x %02x %02x\n",
2009
buffer[0], buffer[1], buffer[2], buffer[3]);
2015
* sd_read_cache_type - called only from sd_revalidate_disk()
2016
* called with buffer of length SD_BUF_SIZE
2019
sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2022
struct scsi_device *sdp = sdkp->device;
2027
struct scsi_mode_data data;
2028
struct scsi_sense_hdr sshdr;
2029
int old_wce = sdkp->WCE;
2030
int old_rcd = sdkp->RCD;
2031
int old_dpofua = sdkp->DPOFUA;
2034
if (sdp->skip_ms_page_8) {
2035
if (sdp->type == TYPE_RBC)
2038
if (sdp->skip_ms_page_3f)
2041
if (sdp->use_192_bytes_for_3f)
2045
} else if (sdp->type == TYPE_RBC) {
2053
/* cautiously ask */
2054
res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2057
if (!scsi_status_is_good(res))
2060
if (!data.header_length) {
2063
sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
2066
/* that went OK, now ask for the proper length */
2070
* We're only interested in the first three bytes, actually.
2071
* But the data cache page is defined for the first 20.
2075
else if (len > SD_BUF_SIZE) {
2076
sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2077
"data from %d to %d bytes\n", len, SD_BUF_SIZE);
2080
if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2084
if (len > first_len)
2085
res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2088
if (scsi_status_is_good(res)) {
2089
int offset = data.header_length + data.block_descriptor_length;
2091
while (offset < len) {
2092
u8 page_code = buffer[offset] & 0x3F;
2093
u8 spf = buffer[offset] & 0x40;
2095
if (page_code == 8 || page_code == 6) {
2096
/* We're interested only in the first 3 bytes.
2098
if (len - offset <= 2) {
2099
sd_printk(KERN_ERR, sdkp, "Incomplete "
2100
"mode parameter data\n");
2103
modepage = page_code;
2107
/* Go to the next page */
2108
if (spf && len - offset > 3)
2109
offset += 4 + (buffer[offset+2] << 8) +
2111
else if (!spf && len - offset > 1)
2112
offset += 2 + buffer[offset+1];
2114
sd_printk(KERN_ERR, sdkp, "Incomplete "
2115
"mode parameter data\n");
2121
if (modepage == 0x3F) {
2122
sd_printk(KERN_ERR, sdkp, "No Caching mode page "
2125
} else if ((buffer[offset] & 0x3f) != modepage) {
2126
sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
2130
if (modepage == 8) {
2131
sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2132
sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2134
sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2138
sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2139
if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
2140
sd_printk(KERN_NOTICE, sdkp,
2141
"Uses READ/WRITE(6), disabling FUA\n");
2145
if (sdkp->first_scan || old_wce != sdkp->WCE ||
2146
old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2147
sd_printk(KERN_NOTICE, sdkp,
2148
"Write cache: %s, read cache: %s, %s\n",
2149
sdkp->WCE ? "enabled" : "disabled",
2150
sdkp->RCD ? "disabled" : "enabled",
2151
sdkp->DPOFUA ? "supports DPO and FUA"
2152
: "doesn't support DPO or FUA");
2158
if (scsi_sense_valid(&sshdr) &&
2159
sshdr.sense_key == ILLEGAL_REQUEST &&
2160
sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2161
/* Invalid field in CDB */
2162
sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2164
sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
2167
sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
2174
* The ATO bit indicates whether the DIF application tag is available
2175
* for use by the operating system.
2177
static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2180
struct scsi_device *sdp = sdkp->device;
2181
struct scsi_mode_data data;
2182
struct scsi_sense_hdr sshdr;
2184
if (sdp->type != TYPE_DISK)
2187
if (sdkp->protection_type == 0)
2190
res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2191
SD_MAX_RETRIES, &data, &sshdr);
2193
if (!scsi_status_is_good(res) || !data.header_length ||
2195
sd_printk(KERN_WARNING, sdkp,
2196
"getting Control mode page failed, assume no ATO\n");
2198
if (scsi_sense_valid(&sshdr))
2199
sd_print_sense_hdr(sdkp, &sshdr);
2204
offset = data.header_length + data.block_descriptor_length;
2206
if ((buffer[offset] & 0x3f) != 0x0a) {
2207
sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2211
if ((buffer[offset + 5] & 0x80) == 0)
2220
* sd_read_block_limits - Query disk device for preferred I/O sizes.
2221
* @disk: disk to query
2223
static void sd_read_block_limits(struct scsi_disk *sdkp)
2225
unsigned int sector_sz = sdkp->device->sector_size;
2226
const int vpd_len = 64;
2227
unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2230
/* Block Limits VPD */
2231
scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2234
blk_queue_io_min(sdkp->disk->queue,
2235
get_unaligned_be16(&buffer[6]) * sector_sz);
2236
blk_queue_io_opt(sdkp->disk->queue,
2237
get_unaligned_be32(&buffer[12]) * sector_sz);
2239
if (buffer[3] == 0x3c) {
2240
unsigned int lba_count, desc_count;
2242
sdkp->max_ws_blocks =
2243
(u32) min_not_zero(get_unaligned_be64(&buffer[36]),
2249
lba_count = get_unaligned_be32(&buffer[20]);
2250
desc_count = get_unaligned_be32(&buffer[24]);
2252
if (lba_count && desc_count)
2253
sdkp->max_unmap_blocks = lba_count;
2255
sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2257
if (buffer[32] & 0x80)
2258
sdkp->unmap_alignment =
2259
get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2261
if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2263
if (sdkp->max_unmap_blocks)
2264
sd_config_discard(sdkp, SD_LBP_UNMAP);
2266
sd_config_discard(sdkp, SD_LBP_WS16);
2268
} else { /* LBP VPD page tells us what to use */
2270
if (sdkp->lbpu && sdkp->max_unmap_blocks)
2271
sd_config_discard(sdkp, SD_LBP_UNMAP);
2272
else if (sdkp->lbpws)
2273
sd_config_discard(sdkp, SD_LBP_WS16);
2274
else if (sdkp->lbpws10)
2275
sd_config_discard(sdkp, SD_LBP_WS10);
2277
sd_config_discard(sdkp, SD_LBP_DISABLE);
2286
* sd_read_block_characteristics - Query block dev. characteristics
2287
* @disk: disk to query
2289
static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2291
unsigned char *buffer;
2293
const int vpd_len = 64;
2295
buffer = kmalloc(vpd_len, GFP_KERNEL);
2298
/* Block Device Characteristics VPD */
2299
scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2302
rot = get_unaligned_be16(&buffer[4]);
2305
queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2312
* sd_read_block_provisioning - Query provisioning VPD page
2313
* @disk: disk to query
2315
static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2317
unsigned char *buffer;
2318
const int vpd_len = 8;
2320
if (sdkp->lbpme == 0)
2323
buffer = kmalloc(vpd_len, GFP_KERNEL);
2325
if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2329
sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2330
sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2331
sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2337
static int sd_try_extended_inquiry(struct scsi_device *sdp)
2340
* Although VPD inquiries can go to SCSI-2 type devices,
2341
* some USB ones crash on receiving them, and the pages
2342
* we currently ask for are for SPC-3 and beyond
2344
if (sdp->scsi_level > SCSI_SPC_2)
2350
* sd_revalidate_disk - called the first time a new disk is seen,
2351
* performs disk spin up, read_capacity, etc.
2352
* @disk: struct gendisk we care about
2354
static int sd_revalidate_disk(struct gendisk *disk)
2356
struct scsi_disk *sdkp = scsi_disk(disk);
2357
struct scsi_device *sdp = sdkp->device;
2358
unsigned char *buffer;
2361
SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2362
"sd_revalidate_disk\n"));
2365
* If the device is offline, don't try and read capacity or any
2366
* of the other niceties.
2368
if (!scsi_device_online(sdp))
2371
buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2373
sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2374
"allocation failure.\n");
2378
sd_spinup_disk(sdkp);
2381
* Without media there is no reason to ask; moreover, some devices
2382
* react badly if we do.
2384
if (sdkp->media_present) {
2385
sd_read_capacity(sdkp, buffer);
2387
if (sd_try_extended_inquiry(sdp)) {
2388
sd_read_block_provisioning(sdkp);
2389
sd_read_block_limits(sdkp);
2390
sd_read_block_characteristics(sdkp);
2393
sd_read_write_protect_flag(sdkp, buffer);
2394
sd_read_cache_type(sdkp, buffer);
2395
sd_read_app_tag_own(sdkp, buffer);
2398
sdkp->first_scan = 0;
2401
* We now have all cache related info, determine how we deal
2402
* with flush requests.
2410
blk_queue_flush(sdkp->disk->queue, flush);
2412
set_capacity(disk, sdkp->capacity);
2420
* sd_unlock_native_capacity - unlock native capacity
2421
* @disk: struct gendisk to set capacity for
2423
* Block layer calls this function if it detects that partitions
2424
* on @disk reach beyond the end of the device. If the SCSI host
2425
* implements ->unlock_native_capacity() method, it's invoked to
2426
* give it a chance to adjust the device capacity.
2429
* Defined by block layer. Might sleep.
2431
static void sd_unlock_native_capacity(struct gendisk *disk)
2433
struct scsi_device *sdev = scsi_disk(disk)->device;
2435
if (sdev->host->hostt->unlock_native_capacity)
2436
sdev->host->hostt->unlock_native_capacity(sdev);
2440
* sd_format_disk_name - format disk name
2441
* @prefix: name prefix - ie. "sd" for SCSI disks
2442
* @index: index of the disk to format name for
2443
* @buf: output buffer
2444
* @buflen: length of the output buffer
2446
* SCSI disk names starts at sda. The 26th device is sdz and the
2447
* 27th is sdaa. The last one for two lettered suffix is sdzz
2448
* which is followed by sdaaa.
2450
* This is basically 26 base counting with one extra 'nil' entry
2451
* at the beginning from the second digit on and can be
2452
* determined using similar method as 26 base conversion with the
2453
* index shifted -1 after each digit is computed.
2459
* 0 on success, -errno on failure.
2461
static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2463
const int base = 'z' - 'a' + 1;
2464
char *begin = buf + strlen(prefix);
2465
char *end = buf + buflen;
2475
*--p = 'a' + (index % unit);
2476
index = (index / unit) - 1;
2477
} while (index >= 0);
2479
memmove(begin, p, end - p);
2480
memcpy(buf, prefix, strlen(prefix));
2486
* The asynchronous part of sd_probe
2488
static void sd_probe_async(void *data, async_cookie_t cookie)
2490
struct scsi_disk *sdkp = data;
2491
struct scsi_device *sdp;
2498
index = sdkp->index;
2499
dev = &sdp->sdev_gendev;
2501
gd->major = sd_major((index & 0xf0) >> 4);
2502
gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2503
gd->minors = SD_MINORS;
2505
gd->fops = &sd_fops;
2506
gd->private_data = &sdkp->driver;
2507
gd->queue = sdkp->device->request_queue;
2509
/* defaults, until the device tells us otherwise */
2510
sdp->sector_size = 512;
2512
sdkp->media_present = 1;
2513
sdkp->write_prot = 0;
2517
sdkp->first_scan = 1;
2519
sd_revalidate_disk(gd);
2521
blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2522
blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
2524
gd->driverfs_dev = &sdp->sdev_gendev;
2525
gd->flags = GENHD_FL_EXT_DEVT;
2526
if (sdp->removable) {
2527
gd->flags |= GENHD_FL_REMOVABLE;
2528
gd->events |= DISK_EVENT_MEDIA_CHANGE;
2532
sd_dif_config_host(sdkp);
2534
sd_revalidate_disk(gd);
2536
sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2537
sdp->removable ? "removable " : "");
2538
scsi_autopm_put_device(sdp);
2539
put_device(&sdkp->dev);
2543
* sd_probe - called during driver initialization and whenever a
2544
* new scsi device is attached to the system. It is called once
2545
* for each scsi device (not just disks) present.
2546
* @dev: pointer to device object
2548
* Returns 0 if successful (or not interested in this scsi device
2549
* (e.g. scanner)); 1 when there is an error.
2551
* Note: this function is invoked from the scsi mid-level.
2552
* This function sets up the mapping between a given
2553
* <host,channel,id,lun> (found in sdp) and new device name
2554
* (e.g. /dev/sda). More precisely it is the block device major
2555
* and minor number that is chosen here.
2557
* Assume sd_attach is not re-entrant (for time being)
2558
* Also think about sd_attach() and sd_remove() running coincidentally.
2560
static int sd_probe(struct device *dev)
2562
struct scsi_device *sdp = to_scsi_device(dev);
2563
struct scsi_disk *sdkp;
2569
if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2572
SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2576
sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2580
gd = alloc_disk(SD_MINORS);
2585
if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2588
spin_lock(&sd_index_lock);
2589
error = ida_get_new(&sd_index_ida, &index);
2590
spin_unlock(&sd_index_lock);
2591
} while (error == -EAGAIN);
2594
sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
2598
error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2600
sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
2601
goto out_free_index;
2605
sdkp->driver = &sd_template;
2607
sdkp->index = index;
2608
atomic_set(&sdkp->openers, 0);
2610
if (!sdp->request_queue->rq_timeout) {
2611
if (sdp->type != TYPE_MOD)
2612
blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2614
blk_queue_rq_timeout(sdp->request_queue,
2618
device_initialize(&sdkp->dev);
2619
sdkp->dev.parent = dev;
2620
sdkp->dev.class = &sd_disk_class;
2621
dev_set_name(&sdkp->dev, dev_name(dev));
2623
if (device_add(&sdkp->dev))
2624
goto out_free_index;
2627
dev_set_drvdata(dev, sdkp);
2629
get_device(&sdkp->dev); /* prevent release before async_schedule */
2630
async_schedule(sd_probe_async, sdkp);
2635
spin_lock(&sd_index_lock);
2636
ida_remove(&sd_index_ida, index);
2637
spin_unlock(&sd_index_lock);
2647
* sd_remove - called whenever a scsi disk (previously recognized by
2648
* sd_probe) is detached from the system. It is called (potentially
2649
* multiple times) during sd module unload.
2650
* @sdp: pointer to mid level scsi device object
2652
* Note: this function is invoked from the scsi mid-level.
2653
* This function potentially frees up a device name (e.g. /dev/sdc)
2654
* that could be re-used by a subsequent sd_probe().
2655
* This function is not called when the built-in sd driver is "exit-ed".
2657
static int sd_remove(struct device *dev)
2659
struct scsi_disk *sdkp;
2661
sdkp = dev_get_drvdata(dev);
2662
scsi_autopm_get_device(sdkp->device);
2664
async_synchronize_full();
2665
blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
2666
blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
2667
device_del(&sdkp->dev);
2668
del_gendisk(sdkp->disk);
2671
mutex_lock(&sd_ref_mutex);
2672
dev_set_drvdata(dev, NULL);
2673
put_device(&sdkp->dev);
2674
mutex_unlock(&sd_ref_mutex);
2680
* scsi_disk_release - Called to free the scsi_disk structure
2681
* @dev: pointer to embedded class device
2683
* sd_ref_mutex must be held entering this routine. Because it is
2684
* called on last put, you should always use the scsi_disk_get()
2685
* scsi_disk_put() helpers which manipulate the semaphore directly
2686
* and never do a direct put_device.
2688
static void scsi_disk_release(struct device *dev)
2690
struct scsi_disk *sdkp = to_scsi_disk(dev);
2691
struct gendisk *disk = sdkp->disk;
2693
spin_lock(&sd_index_lock);
2694
ida_remove(&sd_index_ida, sdkp->index);
2695
spin_unlock(&sd_index_lock);
2697
disk->private_data = NULL;
2699
put_device(&sdkp->device->sdev_gendev);
2704
static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
2706
unsigned char cmd[6] = { START_STOP }; /* START_VALID */
2707
struct scsi_sense_hdr sshdr;
2708
struct scsi_device *sdp = sdkp->device;
2712
cmd[4] |= 1; /* START */
2714
if (sdp->start_stop_pwr_cond)
2715
cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
2717
if (!scsi_device_online(sdp))
2720
res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
2721
SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2723
sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
2724
sd_print_result(sdkp, res);
2725
if (driver_byte(res) & DRIVER_SENSE)
2726
sd_print_sense_hdr(sdkp, &sshdr);
2733
* Send a SYNCHRONIZE CACHE instruction down to the device through
2734
* the normal SCSI command structure. Wait for the command to
2737
static void sd_shutdown(struct device *dev)
2739
struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2742
return; /* this can happen */
2745
sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2746
sd_sync_cache(sdkp);
2749
if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2750
sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2751
sd_start_stop_device(sdkp, 0);
2754
scsi_disk_put(sdkp);
2757
static int sd_suspend(struct device *dev, pm_message_t mesg)
2759
struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2763
return 0; /* this can happen */
2766
sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2767
ret = sd_sync_cache(sdkp);
2772
if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
2773
sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2774
ret = sd_start_stop_device(sdkp, 0);
2778
scsi_disk_put(sdkp);
2782
static int sd_resume(struct device *dev)
2784
struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2787
if (!sdkp->device->manage_start_stop)
2790
sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
2791
ret = sd_start_stop_device(sdkp, 1);
2794
scsi_disk_put(sdkp);
2799
* init_sd - entry point for this driver (both when built in or when
2802
* Note: this function registers this driver with the scsi mid-level.
2804
static int __init init_sd(void)
2806
int majors = 0, i, err;
2808
SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2810
for (i = 0; i < SD_MAJORS; i++)
2811
if (register_blkdev(sd_major(i), "sd") == 0)
2817
err = class_register(&sd_disk_class);
2821
err = scsi_register_driver(&sd_template.gendrv);
2825
sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
2827
if (!sd_cdb_cache) {
2828
printk(KERN_ERR "sd: can't init extended cdb cache\n");
2832
sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
2834
printk(KERN_ERR "sd: can't init extended cdb pool\n");
2841
kmem_cache_destroy(sd_cdb_cache);
2844
class_unregister(&sd_disk_class);
2846
for (i = 0; i < SD_MAJORS; i++)
2847
unregister_blkdev(sd_major(i), "sd");
2852
* exit_sd - exit point for this driver (when it is a module).
2854
* Note: this function unregisters this driver from the scsi mid-level.
2856
static void __exit exit_sd(void)
2860
SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2862
mempool_destroy(sd_cdb_pool);
2863
kmem_cache_destroy(sd_cdb_cache);
2865
scsi_unregister_driver(&sd_template.gendrv);
2866
class_unregister(&sd_disk_class);
2868
for (i = 0; i < SD_MAJORS; i++)
2869
unregister_blkdev(sd_major(i), "sd");
2872
module_init(init_sd);
2873
module_exit(exit_sd);
2875
static void sd_print_sense_hdr(struct scsi_disk *sdkp,
2876
struct scsi_sense_hdr *sshdr)
2878
sd_printk(KERN_INFO, sdkp, " ");
2879
scsi_show_sense_hdr(sshdr);
2880
sd_printk(KERN_INFO, sdkp, " ");
2881
scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
2884
static void sd_print_result(struct scsi_disk *sdkp, int result)
2886
sd_printk(KERN_INFO, sdkp, " ");
2887
scsi_show_result(result);